Method of and apparatus for repairing asphalt pavements



(No Model.)

A.;H. PERKINS. METHOD OP AND APPARATUS POR REPAIRING ASPHALTl PAVEMENTS.

No."517,191. Patented Mar. 27, -1894. l

MII l THE NAYloNAL umomnAPyuNn couPANY.

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NrrnD STATES ATENT OFFICE..

AMOS H. PERKINS, OF CHICAGO, ILLINOIS.

METHOD 0F AND APPARATUS FOR REPAIRING ASPHALT PAVEMENTS.

SPECIFICATION forming part of Letters Patent No. 517,191, dated March 27, 1894. T

Application filed September 20,1893. Serial No. 486,013. (No model.)

To all whom it may concern:

Beit known that I, AMOS H. PERKINS, a citizen of the United States, residing at Chicago, Illinois, have invented certain new and useful Improvements in Methods of and Apparatus for Repairing Asphalt Pavements, of which the following is a specification.

The object of my invention is to proyide a simple, economical and eflicient method of and apparatus for repairing asphalt pavements, and it is particularly designed to be an lmprovement upon the method and apparatus shown in Letters Patent Nos. 501,536 and 50l,537, granted to me July 18, 1893; and my lnlvention consists in the details, combinatlons and arrangements hereinafter described and claimed.

In the drawings, Figure l is a side elevation, partly in section, of an apparatus for carrying out myinvention; and Fig. 2 a transverse section taken on line 2 of Fig. l, looking in the direction of th'e arrow.

In the methods of repairing now in ordinary use, it is customary to dig out or pick the surface of the material around the spot to be repaired. When the material has been removed, the cut thus made is cleansed and supplied with a new body of material. The new material is applied in a heated state, and smoothed and ironed down in the usual manner, the tar acting as a binding agent to hold the same in place. This method, however, leaves a line or ridge between the old hard material and the new material, which is plainly discernible and more or less of a detriment to the pavement.

In the use of my improvements, as shown and described in the Letters Patent above referred to, there is more or less danger of burning the material on the immediate surface from the contacting iiames, before the particles deep down have been softened or melted. To obviate these objections, and at the same time provide an efficient method of and apparatus for repairing asphalt. pavements are the principal objects of my invention.

In the preferred form of carrying out my invention, as illustrated by the drawings, I provide a suitable tank, A, for holding the gasoline, mounted on a wheel frame, B. Secured to and supported by the tank is an elliptical-shaped cast-iron cylinder, C, for the reception of air, connected to and communicatin g with the air space of the tank by means of a small pipe, c, so that the air which is supplied tothe tank under pressure, by means of an air pump, D, is allowed to enter the elliptical-shaped cylinder. I surround this elliptical-shaped cylinder with an outerjacke't or envelope, C', preferably made of wire cloth and asbestus material, which leaves a heating chamber, c', between it and the cylinder. I provide a set of oil supply pipes, E, which connect with the gasoline in the tank, and provide these pipes with a series of burners, e, arranged in such manner that the gasoline or oil which is supplied to them under pressure is ignited and projected against the castiron surface of the cylinder, C. The llame during its burning almost envelops the same in the chamber between the cylinder andthe outer envelope, in such manner as to heat the cylinder to a very high temperature,and also the air contained therein.

I provide a set of horizontal pipes, G, which are connected to each other bya set of manifolds, g, connected to the cylinder and supported by two pipes, g', in such manner as to be from about four to six inches above the pavement. These horizontal pipes'are provided with a number of perforations, arranged iu such manner as to project the heated air against the pavement at an angle of about forty five degrees. I inclose and cover these horizontal pipes by a me' tallic hood, H, which may be covered with asbestus material, so as to confine the heated air to as small a space as possible and against the surface of the pavement to be softened. This hood is supported in position, preferably contacting the jacket, C', which sursounds the elliptical cylinder, by means of stay rods, h, leaving the bottom edges but a slight distance above the pavement. I provide the apparatus with a handle, I, whereby the operator may readily move it to any desired spot.

The method of repairing asphalt pavements by my process, and the operation of the apparatus are about as follows: The tank is supplied with a sufcient quantity of gasoline, or other liquid Ahydro-carbon, and air under pressure is forced into the tank by means IOO of the air pump, D, which forces the liquid hydro-carbons through the supply pipes to the burners, which are immediately ignitedthe flame surrounding the cast-iron cylinder, thereby super-heating the air contained therein. Vhen the air has reached the desired temperature, the operator opens the valve, c2, on the air supply pipe, c, and air under pressure immediately enters the ellipticalshaped cylinder, forcing the hot air down into the horizontal pipes, G, with considerable pressure--say, Iabout sixty pounds to the square inch-and against the heated pavement. The air in passing through the cylinder from the tank is immediately superheated and forced out through the horizontal pipes against the pavement, thereby furnishing a continuous supply of hot air to the pavement. This blast of heated air against the surface of the asphalt readily and easily softens the surface of the same, Without any danger Whatever of burning, until it has become suliiciently softened, when the apparatus is removed to a different location. The material thus softened is agitated by means ofa rake, or other suitable instrument, and the requisite amount of new materialv of the same degree of softness is added to the spot or depression to be repaired and subjected to the usual smoothing and finishing operation, as in the case of a neva7 pavement. This can be done without the use of any more tar for the purpose of uniting the parts or sections of the material, and is completed without any material liue of demarltation between the old and new material.

WVhile I have described more or less minutely the details of `my invention, I do not desire to be limited unduly thereto, any more than is pointed out in the claims. On the contrary, I contemplate variations in form,

' construction and arrangement, and the use of equivalents, as circumstances may suggest or necessity render expedient.

I claiml. The method of repairing asphalt pavements, which consists in subjecting the part to be repaired to a blast of super-heated air, adding new material, and smoothing and burnishing it, substantially as described.

2. In apparatus for repairing asphalt pavements, the combination of a receptacle for containing air under pressure, means for super-heating the same, and means for projecting the heated air against the pavement, substantially as described.

3. In apparatus for repairing asphalt pavements, the combination of a receptacle for containing air under pressure, means for super-heating the same, means for projecting the heated air against the pavement, and means for confining the heated air in position against the pavement, substantially as described.

4. In apparatus for repairing asphalt pavements, the combination of a metallic receptacle for containing air under pressure, means for furnishing a supply of air under pressure to the receptacle, means for super-heating the same, means for projecting the heated air under pressure against the pavement, and means for confining the super-heated air in position against the pavement, substantially as described.

5. In apparatus for repairing asphalt pavements, the combination of a receptacle for containing air under pressure, a set of horizontal perforated pipes connected with the receptacle and held in position above the pavement, means for furnishing a supply of air under pressure to the receptacle, and means for super-heating the air, substantially as described.

G. In apparatus for repairing asphalt pavements, the combination of a receptacle for containing air under pressure, a set of horizontal perforated pipes connected with the receptacle and held in position above the pavement, means for furnishing a supply of air under pressure to the receptacle, means for super-heating the air, and means for coniining the su per-heated air in position against the pavement, substantially as described.

7. In apparatus for repairing asphalt pavements, the combination of a cylinder for containing air nnderpressure, a jacket orienvelope surrounding the same and leaving an air space betweenit and the cylinder, fuel burners arranged to enter such space and super-heat the cylinder, and means for projecting the heated air against the pavement, substantially as described.

S. In apparatus for` repairing asphalt pavements, the combination of a lreservoir for containing liquid hydro-carbons, means for furnishing a supply of air under pressure to the same, a cylinder communicating with the air space of the fuel reservoir,aseries of burners connected with the fuel supply and adapted to super-heat the cylinder with its contained air, means for projecting the heated air against the pavement, and means for confining the super-heated airin position against the pavement, substantially as described.

AMOS II. PERKINS.

Witnesses:

THOMAS F. SHERIDAN, JULIUs Moses. 

